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cricket20 [7]
3 years ago
15

How many ways are there to distribute n graded homeworks to n students such that none of them gets their own homework back?

Mathematics
1 answer:
Yuri [45]3 years ago
8 0
Assume N students

Student 1 can get (n-1) papers
Student 2 can get (n-1) papers
Student 3 can get (n-1) papers
etc
Student N can get (n-1) papers

So for N students you can have N(n-1)
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The total weight of 15 boxes is 45 pounds .how much would 40 boxes weigh
Lera25 [3.4K]
40 boxes would weigh would weigh 120 pounds
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4 years ago
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I say it’s D but i need reassurance
Brilliant_brown [7]

Answer:

Yes it's D or it's B

Step-by-step explanation:

3 0
3 years ago
For how many movies is the cost of the plans the same?
sesenic [268]

Answer:

For 36 movies the cost of both the plans is same.

Step-by-step explanation:

Let us assume foe m movies, both the plans cost same.

Now, PLAN A:

Annual Fee = $45

Cost per movie  =  $2.50

⇒The cost of watching m movies  = m x (Cost of 1 movie)

= m x ($2.50) = 2.5  m

So, the total cost of Plan  A  = Annual Fee + Cost of m moves

                                                 = 45 + 2.50 m

PLAN B:

Cost per movie  =  $3.75

⇒The cost of watching m movies  = m x (Cost of 1 movie)

= m x ($3.75) = 3.75  m

ACCORDING TO QUESTION:

for m movies,  Cost of plan A = Cost of plan B

⇒45 + 2.50 m  = 3.75  m

or, 3.75 m  - 2.5 m = 45

or, m  = 45/1.25 = 36

or, m  = 36

Hence, for 36 movies the  cost of  both the plans is same.

5 0
3 years ago
3333333 help me help me
stiks02 [169]

Answer:

C is the answer thank you

5 0
3 years ago
Points A, B, and C are on line AC. Angle CBD has a measure of 140°. What is the measure of angle ABD? 40° 50° 60° 70°
melamori03 [73]

Answer: The correct option is 1 and measure is 40.

Explanation:

It is given that points A, B, and C are on line AC. Angle CBD has a measure of 140°.

Draw a diagram using given information,

From the figure it is noticed that the angle CBD and angle ABD are lies on straight line and lies on the same arc. So, the angle CBD and angle ABD are supplementary angles and their sum is 180 degree.

\angle ABD+\angle  CBD=180

\angle ABD+140=180

\angle ABD=180-140

\angle ABD=40

Therefore, the correct option is 1.

7 0
4 years ago
Read 2 more answers
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